Need Help About Fish Fighting

[hadysnoop]

hello everyone , i'm having a problem with my clown knife, it's attacking one oscar fish,attacking the same one all the time, how can i solve the problem?
120 liters, changing 25% ofwater every 3 days, 2 oscars one clown knife 1 red parrot and 2 bengasious, the smaller oscar was the first in the aquarium then came the clown and the bigger oscar together, now the oscar got bited and it's tail is cutted out, why is it attacking the same fish all the time? what can i do? am afraid to leave them alone ,am not turning the lights off, here is a video 2 days ago showing whats going on,, please help me and thanx for everyone from now

http/www.youtube.com/watch?v=NhXm1...ature=youtu.be

 

[creeker]

As they say in the old Western movies, "This town ain't big enough for the both of us." Only in this case "this town" is your tank. Way too small for those species. There's bound to be trouble. BTW, your video didn't post.

 

[Louiseness]

You are aware a properly looked after clown knife could get almost as big as the whole length of your tank, right?

Sorry, but your tank is way too small and overstocked and clown knives are predators. You either need to get a MUCH bigger tank or rehome your current fish and get some much smaller community fis that would be suitable for a tank that size.

 

[N0body Of The Goat]

Even swapping a 120l fopr a 120g would not give your fish stocking enough room, without even talking into account your 2 Pangasious Catfish should reach well over 4-feet and simply should not be in the hobby.

Given the size the Oscars and Clown Knifefish should reach (~14" and ~24" respectively) and how Oscars can behave as they get bigger, you need something in the order of a 96x48x48 inch tank (yes, 8x4x4 foot tank, to give the Knife room to turn).

Things will only get worse in this tank you currently have, if fish do not die of "war wounds" they will die from stunted growth or toxins (ammonia, nitrite or even nitrate given how much food you should be giving them and 25% water changes every 3 days will not be enough).